Yellow Onions are full-flavored and are a reliable standby for cooking almost anything. Yellow onions turn a rich, dark brown color when cooked and give French Onion Soup its tangy sweet flavor. All-purpose and most popular, approximately 87% of the U.S. onion crop is comprised of yellow varieties. The most well- known sweet onions are yellow. The best type of onion for caramelizing is a yellow storage variety. Cooking brings out this variety